Excavator.



H. A. DENOVAN.

EXCAVATOR. APPucAUoN man ocT.15,1917.

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` R. A. DENOVAN.

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APPLICATION FILED OCT. I5. ISIII. Im mente@ 9109.291919.

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EXCAVATOR.

Specification of Letters Patent.

Patented Apr. 29, 19119..

Application led October 15, 1917. Serial No. 196,648.

To all whom t may concern:

Be it known that I, ROBERT A. DENOVAN, a subject of the King of Great Britain, residing at Dalkeith, in the Province of 0ntario, Canada, have invented certain new and useful Improvements in Excavators; and I do hereby declare that the following is a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

rlhe present invention relates to excavators and more particularly to that class of apparatus for excavating earth or dirt and elevating the sameV to discharge it along the side of the bank or into cars or wagons, as set forth in my former patent granted October 3, 1916, Number 1,200,173.

An object of the present invention is to improve the general character and ei'iiciency of such apparatus and to provide novel means for performing various operations necessary in digging,u elevating and discharging the dirt or other material.

`With the above and other objects in view which will hereinafter appear as the description continues, the invention consists of the novel features of construction, combination and formation of parts as will be hereinaftermore fully described and particularly pointed out in the appended claims.

In the accompanying drawings has been shown a simple and preferred form of the invention, it being, however2 understood that no limitation is necessarily made to the preoise structural details herein exhibited, but the right is hereby reserved to any changes, alterations or modifications to which recourse may be had that come within the scope of the claims without departing from the spirit of the invention or sacrificing the eiciency of the same.

In the accompanying drawings:

Figure 1 is a side elevation of the apparatus embodying the present invention when in use,'but having a portion of the frame work broken away;

Fig. 2 is a plan view of the same also having portions of the frame work broken away to better illustrate the invention;

Fig. 3 is a front elevation of the frame work having the boom and hoisting and loading mechanisms removed;

Fig. 4 is a detail plan view of the boom support; and,

Fig. 5 is an elevation of the same.

Referring now more particularly to the accompanying drawings wherein like and corresponding parts are designated by similar reference charactersthroughout the several views- The device herein shown comprises a skid consisting of a pair of spaced runners 1 which are connected by means of the transverse bars -2 and 3 respectively and said bars being connected by means of the longitudinally extending central bar 4 and the diagonal bars 5. Secured to the bar 3 are the vertically extending brace bars 6 which converge toward their upper ends and are connected by means of the bracket 7. A brace bar 8 is also connected to this bracket 7 and the rear transverse bar 2. These vertical bars 6 tilt toward the front of the frame, as better shown in Figs. 1 and 2 and connecting the bracket 7 with the transverse bar 3 are the vertically extending tie rods 9. The bars 6 are further braced by means of the transverse bars 10 and 11 and the latter having projecting ends for a purpose which will be later set forth.

Secured to the bar 3 adjacent its medial portion is a bearing plate 12 carrying a pin 13 and supported upon this plate 12 and adapted to receive the pin 13, is a bearing socket or hub 14. This hub 14 has a pin 15 extending therethrough and secured upon this pin 15 are the plates 16 which are connected to the lower end of the boom 17. Also journaled uponthe upper face of the hub 14 are a pair of spaced grooved rollers 18, the purpose of which will be later set forth. The outer end of the boom 17 is connected to the bracket 7 by means of the tie'rods 19. A scoop 20 is employed for gathering and digging the earth and connected to this scoop 2O is a hoisting cable 21. This hoisting cable extends over a sheave 22 snpported on the outer end of the boom 17 and the cable also passes over the pulley 23, and its opposite endV is connected and wound upon a drum 24. Suitably connected to the scoop 20 is a dumping cable 25, whereby when the operator pulls upon this cable 25 the scoop may be released so that it may dump the contents contained therein in the usual manner. A drag cable 26 has one end connected to the scoop 20 and this drag cable passes over the sheave 27 carried by the boom 17, then between the grooved pulleys 18 and finally has its opposite end wound upon and secured to the loading drum 28. Supported upon the bar 4 are the brackets 29 and these brackets have journaled thereA in a sha-ft which carries the loading drum 28. Formed with this loading drum 28 is a drum 30 having a power cable 31 connectedk thereto and wound thereupon, and which cable extends over the sheave 32. A draft animal or other suitable power may be connected to this cable 31, so that upon pulling upon the cable 31 the drums 28 and 30 will be caused to revolve, and in so rotating the drum 28 the scoop 20 will be drawn over the ground, whereby it will scoop up or dig up the earth in obtaining a load. Supported upon the booom 17 are the brackets 33 and these brackets 33 have a shaft journaled therein upon which is mounted the hoisting drum 24. This hoisting drum 24 has also secured thereto a power drum 34. Secured to and wound upon this power drum 34 is a hoisting and boom swinging cable 35. This cable 35 extends over a sheave 36 supported upon the boom 17 and then over a sheave 37 supported upon one of the projecting ends' of the bar 11. A draf-t animal or other suitable power may be connected to this cable so that upon exerting a pull upon the cable the drums 24 and 34 will be caused to revolve, and in so rotating these drums the scoop 20 will be hoisted, whereby duringl the hoisting of the scoop the boom will be caused to be swung upon its pivotedconnections thereby carrying the scoop to one side of the ditch in which it has been digging, so 'that the contents of the scoop may be diunped in a car or wagon on upon the ground at one side of the place wherein it was performing its work.

To further brace the supportingframe, the supporting bars 38 and 39 are provided which are pivotally connected at their upper ends to the bars 6. As better illustrated in Fig. 1, these bars 38 and' 39 extend at each side of the boom and one of the bars may extend to one side of the apparatus to assume the position of the bar 39, soas to permit the boom 17 to swing to either side of the apparatus, as is desired. Pivotally connected to the lower end of the bar 38 is a. foot treadle 40, and rigidly secured to this foot treadle 40 is a vertical bar 41 having one end of a cable 42 connected thereto. This cable 42 extends over a pulley support ed upon the bar 10 and has its opposite end connected to a lever 43 supported upon the boom 17. A band brake 44 extends around the hoisting drum and has one end connectd ed to the lever 43. From this construction it is obvious that when it is desired to lock the drums 24 and 34 against rotation, an operator may press against the treadle 40 thereby applying a brake to these hoisting drums, and the scoop when raised to the desired position will be stopped from raising or lowering until the boom lhas returned to its desired position. When the cable 35 has been released, the boom 17 will return to its normal position or the position as shown in Figs. 1 and 2 of the drawings, and the scoop will be lowered to` digging position by gravity. As the bars 6 are tilted in a forward direction the scoop will return to its normal position.

Pivotally connected to the foot treadle 40 is a lever 45 having one end of a cable 46 connected thereto and the opposite end of this cable 46 is connected to a lever 47. A band brake 48 extends around the loading drum and is connected to this lever 47, whereby when it is desired to stop the rotation of the loading drum the operator may, upon moving the lever 45, apply the band brake to the loading drum.

From the foregoing it is apparent that when a pull is exerted u-pon the cable 31 the scoop 20 will be caused to dig up and obtain a load of dirt, and when a pull is eX- erted upon the cable 35 the scoop 20 will be raised or elevated and at the same time the boom 17 will be caused to swing to either side of the apparatus where the contents of the scoop'may be dumped. When it is desired to dump the scoop at the opposite side of the apparatus, the sheave 37 is secured to the opposite projecting end of the bar 11 and the brace bar 38 is swung to one side of the apparatus, so that it will assume substantially the same position as the position shown of the bar 39 in Fig. 2 of the drawings, and likewise the bar 39 will assume substantially the same position at one side of the boom as the position shown in Fig. 2 of the bar 38.

Having thus fully described my invention, what I claim as newand desire to secure by Letters Patent is:

1. An excavator comprising in combination `a supporting frame, a. movable frame carried thereby, a scoop adapted to be supported by said movable frame, means for raising said scoop, said means for raising the scoop adapted to move said frame, a loading drum carried by the supporting frame, a cable adapted to be wound upon said loading drum, one end of said cable being connected to said scoop, a brake adapted to be applied to said loading drimi and means arranged adjacent said scoop when in digging position for controlling said brake substantially as and for thel purpose specified.

2. An excavator comprising in combination a supporting frame, aY movable frame' carried thereby, a scoop adapted to be supported by said movable frame, means for the operator for retarding the movement of raising said scoop, seid ineens for raising said scoop. l0 the scoop adapted to move said frame, a In witness Iwhereof I have hereunto set loading drum, a cable adapted to be Wound my hand in the presence of two witnesses.

upon said loading drum, one end of said ROBERT A. DENOVAN. cable being connected to said scoop, whereby Witnesses:

bhe cable will drew the scoop over the R. LABRossE,

ground, and means under the control of CHRISTENA MACINTOSH.

@opium of this peten moy be obtained for ve cents each, by addressing the fl'ommismioneiI oil Mbembe,

Washington, M. @im 

